How to resize root partition ?

Hi !

I installed my first linux groupwise server on OES 2 (groupwise data on nss volume) but now my root partition (ext3) is 100% full (I created a 10 Gb root partition) ! The server is hosted on Vmware so it was easy to increase the size of the virtual disk where the root partition is, but is there an easy way to resize the root partition to use that extra space ?

Thanks,

Antonio